David, Perceptive Apprentice

When David enters the battlefield, choose
an opponent to become your mentor.
Whenever your mentor casts a non-creature spell,
draw a card.
Whenever a creature enters the battlefield under
your mentor's control, create a 1/1 token that's
a copy of that card.
{b}{b}: David gains an ability of a card in his
mentor's graveyard until end of turn.